BSD_BOOTBLOCK_SIZE
#define BBSIZE BSD_BOOTBLOCK_SIZE
error = image_write(0, buf, BSD_BOOTBLOCK_SIZE / secsz);
.bootcode = BSD_BOOTBLOCK_SIZE,
blk += BSD_BOOTBLOCK_SIZE / secsz;
buf = malloc(BSD_BOOTBLOCK_SIZE);
memcpy(buf, bootcode, BSD_BOOTBLOCK_SIZE);
memset(buf, 0, BSD_BOOTBLOCK_SIZE);
le32enc(&d->d_bbsize, BSD_BOOTBLOCK_SIZE);